My '64 Greenbrier came with that nozzle and its in good original condition. But during restoration I converted it to an electric pump because the original pumps so much fluid per cycle it leaves a mess. But even then I only remember needing to use it once in 30 years. I'd rather clean the windshield by hand.

"NOTE: these are NOS made by the original supplier of the squirter and wiper systems for GM and many other auto MFGs of the era. However this is NOT the exact unit that would have been installed by GM or its dealers. It is a very similar unit that looks great, fits the stock location, and mounts like the original."

.-----------------------------------------------WA. state, 1 mile south of the Canadian border,I am not at the end of the world, but you can see it from here.'66 Monza Coupe - 4spd, 140 Daily driver beater'67 Monza Vert. - PG, 140 Daily driver beater

That threaded portion of that is very to the wet arm adapters used on my motor home and many others. I have made wax molds then filed the core with Marine Tex to make similar items. Then a quick coat of some fake chrome paint and your good to go. If someone has a good original, this could be an interesting project for someone.